Roof Slope Angle Chart

On blue prints architects engineers usually display the pitch of a roof in the format shown on the image where number 4 represents a rise and number 12 represents a length.

Roof slope angle chart.

Measure the rise of your roof. After finding out your roof pitch angles you can use the calculator to perform the calculations for you instead of doing them manually. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. Roof pitch is a term describing how steep or flat your roof slope is.

Pitch rise run 1 5 6 25. Whatever you decide to go with though finding the best roof pitch chart is going to be very important. Roof pitch angle and slope factor charts. Notes to the table above.

Let s say it is equal to 1 5 m. Low slope roofs are from 0 to 3 12 in pitch. To obtain an accurate roof pitch measurement properly measure the rise and run. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m.

Then you ll be able to measure slope from an unfinished attic space under the roof. Some sources consider low slope to include 3 12 pitch roofs. Calculate the roof pitch as the proportion of rise and run. Working with a local roofer is going to be your best chance of finding this information including arranging the work to be carried out.

If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks. Calculate the rafter length substituting these values into the following formula.